Lens pattern



Dec. 23, 1924. l,52o,445

W. B. RUSHM ER LENS PATTERN Filed Apri1y24, 1920 nahme/@0 Patented Dec. 23, 1924,

UITED STATES WLLIAM B. RUSHMER, OF SALT LAKE CITY, UTAH.

LENS PATTERN.

Application filed April 24, 1920. Serial No. 376,348.

lof optical lenses, and it is the primary object of the invention to provide a novel pattern to be employed as a guide to facilitate the cutting or forming of lenses.

A further object of the invention is to ,provide a transparent pattern formed of substantially flexible material to act as a yguide for the use of a hand diamond cutter, ythe pattern being such as to permit the bi- ,focal portion of a lens to be properly lo- ,cated in the formation of a bifocal lens.

vWith the foregoing and other objects in ,View which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in ,the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without `departing` from the spirit of the invent-ion.

Yeferring` to the drawing:-

Figure l illustrates a plan view of a lens blank.

Figure Q. .illustrates a plan view showing .a pattern as applied to the lens blank, to be formed at a degree angle with respect to the vertical.

Figure 3 illustrates a sectional view taken ou line 3-3 of Figure 2.

Figure 4 is a view showing the pattern as applied to a lens blank to be out.

Figure 5 is a plan View of a bifocal lens blankx Figure 6 illustrates a sectional view taken on line l-l of Figure 4l.

Figure 7 illust-rates a pattern positioned is the formation of a lens to be formed at a 900 angle with respect to the vert-ical.

Referring to the drawing in detail, the yreference character 5 designates the lens blank, the grinding operation having been completed to properly shape the opposite surfaces of the lens, and as shown this lens blank is provided with markings indicated at 6 to show the correct axis of the lens.

The pattern indicated at 7, is formed of any suitable flexible transparent material, ,preferablyv Celluloid, so that the pattern will conform to the curvature of the lens surface under operation, the pattern being however formed with a predetermined conguration according to the size and shape of the lens to be cut.

On each lens pattern, are formed in any suitable manner a plurality of lines radiating from a common center, the: correct aXis of the particular pattern being shown by the numerals O to 180, the numerals being disposed to indicate predetermined lines to enable an operator to form or cut a lens at any desired axis. It is to be understood that in the use v,of lens patterns, constructed in accordance with the present invention, to carry out the v present system, it is intended that a number of these lens patterns should be provided, there being a pattern for each standard shape of lens.

By reference to Figure l of the drawing, lit is obvious that due to the transparent ,qualities of the pattern, the bifocal portion of a lens may be located through the pattern, to the end that when` the finished lens is produced, the bifocal portion thereof will have its correct location with respect to the body portion of the lens, thus insuring against the bifocal portion of the lens being ,disposed laterally of its axis. It might be `further stated that due to the flexibility of v the pattern, the pattern will conform to Ithe curvature of the lens surface to eliminate any possibility of the leus pattern slipping, while in use.

In the use of the lens pattern, the pattern yis properly positioned on the lens blank, te ybring the correct axis of the lens under pre- ,determined lines of the blank, whereupon the operator holds the blank against movement, while the hand diamond cutting tool is moved around the periphery of the pattern to cut the lens blank.

Having thus described the invention, what is claimed as new is In a lens pattern, a transparent body portion cut to conform to the curvature of e lens, said body portion having a. plurality In testimony that I claim the foregoing 10 of lines radiating from a, common center, .as my own, I have hereto aiixed my signalsind said pattern adapted to be lised in oon- ,ture in the presence of two witnesses.

neotion With a lens blank having indicating .dots formed thereon, the lines of the pnt- VILLIAIVI B. RUSHIVIER. tern being designed for positioning over the dots so that the pattern may be held in a Witnesses:

particular manner while the lens blank J. ORTH THOMPSON,

is being out. WESLEY V. KING. 

